Xrandr rotating a USB 2.0 display-link device?

[Stirling Westrup]

I don't know about the latest dlink chips, but the older ones do not
support hardware rotation, and the standard backup method for implementing
screen rotation in Xorg fails for devices (like USB-attached Video) that
don't have standard framebuffers.

I know that there are plans to back-port an alternative screen rotation
scheme for older dlink chips, but its pretty far down the 'to do' list, and
probably won't get done any time soon, if at all.


On Mon, Jan 19, 2015 at 11:15 PM, Sunny Dubey <sunny at audiowiki.org> wrote:

> Hi guys,
>
> I have the AOC E1649FWU. It is a USB 2.0 displaylink device.
> http://us.aoc.com/monitor_displays/e1649fwu
>
> It works fine in Linux. But I am unable to rotate it via xrandr.
>
> The screen goes blank when I attempt to rotate left or right. I am
> able to fix the screen by rotating normal. However when I attempt to
> rotate again I get the following error:
>
> [sunny at localhost ~]$ xrandr --output DVI-1-0 --right-of eDP1 --rotate
> normal --mode 1366x768_72.00 --rotate left
> X Error of failed request:  BadValue (integer parameter out of range
> for operation)
>   Major opcode of failed request:  139 (RANDR)
>   Minor opcode of failed request:  7 (RRSetScreenSize)
>   Value in failed request:  0x0
>   Serial number of failed request:  48
>   Current serial number in output stream:  49
>
> I am on Fedora 21 with kernel version 3.17.8-300.fc21.x86_64 and X.org
> version: 1.16.2.901 (1.16.3 RC 1)
>
> The following are links to info people may consider useful in debugging
> this:
>
> EDID information:
>
> https://gist.github.com/intsunny/cc6e1341e68fb9fb0a51
>
> xrandr commands used to config screen:
>
> https://gist.github.com/intsunny/10bac695e0533fcc73f8
>
> dmesg info of screen:
>
> https://gist.github.com/intsunny/2d0b503ca2e8fbb87311
>
> Xorg.0.log output:
>
> https://gist.github.com/intsunny/6333714651b777adeb7b
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-- 
Stirling Westrup
Programmer, Entrepreneur.
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